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After Wednesday's 3-2 win over Kansas City, the Arizona Diamondbacks are now 41-34. That puts them on pace for an 89-73 record, 24 games better than 2010's 65-97 record. That 24 game improvement ties them with the Pittsburgh Pirates for the biggest in the National League.  Here are the current improvements for each NL team:

2011 2011 2011 2011 2010
W L W (Pace) L (Pace) W IMPROVEMENT
ARI 41 34 89 73 65 +24
PIT 37 37 81 81 57 +24
WAS 37 37 81 81 69 +12
MIL 41 35 87 75 77 +10
PHI 47 28 102 60 97 +5
ATL 43 33 92 70 91 +1
STL 40 35 86 76 86 0
NYM 36 38 79 83 79 0
COL 37 37 81 81 83 -2
SFG 40 34 88 74 92 -4
LAD 34 42 72 90 80 -8
CIN 39 37 83 79 91 -8
FLA 33 42 71 91 80 -9
CHC 30 44 66 96 75 -9
HOU 28 48 60 102 76 -16
SDP 32 44 68 94 90 -22

How have the Diamondbacks done it? They've shown improvements both on offense and on the mound, improving their OPS+ (park-adjusted on-base plus slugging percentage, on a scale where 100 is league average) to 102 from 94, and their ERA+ to 102 from 89.  That improvement is quite different from the Pirates, who have seen almost all of their gains from the pitching mound, as their ERA+ has jumped from 80 to 105, while the offense is virtually the same, increasing to 86 from 84. The biggest drop goes to the Padres at -22, who not surprisingly have seen an offensive drop-off from the loss of Adrian Gonzalez, and the Astros at -16.

2011 2011 2010 2011 2010
GAIN OPS+ OPS+ ERA+ ERA+
ARI 24 102 94 102 89
PIT 24 86 84 105 80
MIL 10 102 103 101 89
WAS 12 88 92 108 97
PHI 5 93 98 130 111
ATL 1 91 99 126 112
STL 0 113 101 90 108
NYM 0 99 90 95 105
COL -2 89 92 114 112
SFG -4 85 96 112 119
LAD -8 97 93 88 96
CIN -8 100 107 97 102
FLA -9 90 92 100 102
CHC -9 92 88 86 102
HOU -16 97 83 83 95
SDP -22 85 93 104 108